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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Retained Earnings [Member]
Common dividends declared, per share (in dollars per share)	$ 0.57	$ 0.50
Special common dividends declared, per share (in dollars per share)	$ 0.48
Additional Paid-in Capital [Member]
Common stock options exercised, shares (in shares)	18,979	8,036
Treasury Stock [Member]
Issuance of treasury stock to 401(k) plan, shares (in shares)	1,053	12,834
Purchase of treasury shares, shares (in shares)	670,016	50,118
Purchase of treasury shares, per share (in dollars per share)	$ 31.77	$ 25.20
Common dividends declared, per share (in dollars per share)	$ 1.05	$ 0.50

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